TMS JL. TMS JL. TMS 27L08-45 JL 1024-WORD BY 8-BIT ERASABLE PROGRAMMABLE READ-ONLY MEMORIES
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1 MOS LS 124-WORD BY 8-BT ERASABLE PROGRAMMABLE READ-ONLY MEMORES DECEMBER 1979-REVSED MAY X 8 Organization All nputs and Outputs Fully TTL Compatible Static Operation (No Clocks, l'jo Refresh) Performance Ranges: Max Access TMS ns TMS TMS 27L State Outputs for OR-Ties N-Channel Silicon-Gate Technology 8-Bit Output for Use in Microprocessor Based Systems Min Cycle 35 ns Low Power on TMS 27L mw (Typ) 1% Power Supply Tolerance (TMS 27L8-45 Only) Plug-Compatible Pin-Outs Allowing nterchangeability/upgrade to 16K With Minimum Board Change A7 A6 A5 A4 A3 A2 A1 AO Vss PN CERPAK DUAL-N-LNE PACKAGE (TOPVEWl vee AS A9 Vas es(pe) Voo Program description The TMS , TMS , and TMS 27L8-45 JL are ultra-violet light-erasable, electrically programmable read only memories. They have 8,192 bits organized as 124 words of 8-bit length. The devices are fabricated using N-channel silicon-gate technology for high speed and simple interface with MOS and bipolar circuits. All inputs (including program data inputs) can be driven by Series 74 TTL circuits without the use of external pull-up resistors. Each output can drive one Series 74 or 74LS TL circuit without external resistors. The TMS 27L8 guarantees 2 mv de noise immunity in the high state and 25 mv in the low state. The data outputs for the TMS , TMS , and TMS 27L8-45 are three-state for OR-tying multiple devices on a common bus. These EPROMs are designed for high-density fixed-memory applications where fast turn arounds and/or program changes are required. They are supplied in a 24-pin dual-in-line ceramic cerdip (JL suffix) package designed for insertion in mounting-hole rows on 6-mil (15.2 mm) centers. They are designed for operation from e to 7 e. operation (read mode) address (AO-A9) The address-valid interval determines the device cycle time. The 1-bit positive-logic address is decoded on-chip to select one of the 124 words of 8-bit length in the memory array. AO is the least-significant bit and A9 is the most-significant bit of the word address. chip select, program enable [CS (PE)] When the chip select is low, all eight outputs are enabled and the eight-bit addressed word can be read. When the chip select is high, all eight outputs are in a high-impedance state. 16
2 TMS JL. TMS JL. TMS 27L8-45 JL data out ( 1-8) The chip must be selected before the eight-bit output word can be read. Data will remain valid until the address is changed or the chip is deselected. When deselected, the three-state outputs are in a high-impedance state. The outputs will drive TTL circuits without external components. program The program pin must be held below Vee in the read mode. operation (program mode) erase Before programming, the TMS , TMS , or TMS 27L8-45 is erased by exposing the chip through the transparent lid to high-intensity ultraviolet light (wavelength 2537 angstroms). The recommended minimum exposure dose ( = UV intensity x exposure time) is fifteen watt-seconds per square centimeter. Thus, a typical 1 2 milliwatt per square centimeter, filterless UV lamp will erase the device in a minimum of 21 minutes. The lamp should be located about 2.5 centimeters above the chip during erasure. After erasure, all bits are in the high state. programming Programming consists of successively depositing a small amount of charge to a selected memory cell that is to be changed from the erased high state to the low state. A low can be changed to a high only by erasure. Programming is normally accomplished on a PROM or EPROM Programmer, an example of which is Tl's Universal PROM Programming Module in conjunction with the 99 prototyping system. Programming must be done at room temperature (25 C) only. to start programming (see program cycle timing diagram) First bring the CS (PE) pin to +12 V to disable the outputs and convert them to inputs. This pin is held high for the duration of the programming sequence. The first word to be programmed is addressed (it is customary to begin with the "O" address) and the data to be stored is placed on the 1-8 program inputs. Then a +25 V program pulse is applied to the program pin. After.1 to 1. milliseconds the program pin is brought back to O V. After at least one microsecond the word address is sequentially changed to the next location, the new data is set up and the program pulse is applied. Programming continues in this manner until all words have been programmed. This constitutes one of N program loops. The entire sequence is then repeated N times with N x tw(pr);;. 1 ms. Thus, if tw(pr) = 1 ms; then N = 1, the minimum number of program loops required to program the EPROM. to stop programming After cycling through the N program loops, the last program pulse is brought to O V, then Program Enable [CS (PE)] is brought to V1L which takes the device out of the program mode. The data supplied by the programmer must be removed before the address is changed since the program inputs are now data outputs and change of address could cause a voltage conflict on the output buffer. 1-8 outputs are invalid up to 1 microseconds after the program enable pin is brought from V1H(PE) to V1L- 161
3 logic symbol t EPROM 124x8 (8) AO (7) A1 (6) l9l a1 A'v A2 (1) 2 (5) A'v A3 (11) (4) 3 A4 (13) 4 (3) A123 A5 (14) 5 (2) A6 A'::;J (15) 6 (1) A7 (16) Q7 (23) A 'v AS 1171 (22) A 'v as A9 9 cs (2) t This symbol is in accordance with EEE Std 91 /ANS Y32.14 and recent decisions by EEE and EC. See explanation on page 289. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)* Supply voltage, Vee (see Note 1) Supply voltage, Voo (see Note 1) Supply voltage, Vss (see note 1) All input voltage (except program) (see Note 1 )... Program input (see Note 1) -.3to15V -.3to2V -.3to15V -.3to2V -.3to35V Output voltage (operating, with respect to Vss) to 7V Operating free-air temperature range... e to 1 e Storage temperature range e to 12 5 e NOTE 1: Under absolute maximum ratings, voltage values are with respect to the most-negative supply voltage, Vee lsubstrate). unless otherwise noted. Throughout the remainder of this data sheet, voltage values are with respect to V55. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the "Recommended Operating Conditions" section of this specification is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 162 POST OFFCE BOX DALLAS, TEXAS 75265
4 recommended operating conditions TMS278-35, TMS TMS27L8-45 PARAMETER UNT MN NOM MAX MN NOM MAX Supply voltage, Vee V Supply voltage, V cc V Supply voltage, Voo V Supply voltage, Vss V High-level input voltage, V1H (except program and program enable) 2.4 Vcc Vcc+1 V High-level program enable input voltage, V1HPEl V High-level program input voltage, V1H(PR) V Low-level input voltage, V1L (except program) Vss.65 Vss.65 V Low-level program input voltage, V1L(PR) Note: V1L(PR) max s; V1H(PR) -25 V Vss 1 Vss 1 V H1gn-1evel program pulse input current \sink), l1h(pr) 4 4 ma Low-level program pusle input current (source), l1l(pr) 3 3 ma Operating free-air temperature, TA 7 7 c electrical characteristics over full ranges of recommended operating conditions (unless otherwise noted) TMS , PARAMETER TEST CONDTONS TMS TMS 27L8-45 UNT MN TYPt MAX MN TYPt MAX VoH High-level output voltage OH = -1 µa OH = -1 ma V Vol Low-level output voltage OL = 1.6 ma.45.4 V 11 nput current (leakage) V1 = V to 5.25 V µa lo Output current (leakage) CS(PE) = 5 V, Vo =.4 V to 5.25 V µa lee Supply current from Vee All inputs high, ma ice Supply current from V cc CS(PE) = 5 V, ma loo Supply current from Voo TA = C (worst case) ma TA = 7 C 8 35 PD(AV) Power Dissipation TA= C cs= ov mw TA= C CS = +5 V t All typical values are at TA = 25 C and nominal voltages. capacitance over recommended supply voltage range and operating free-air temperature range, f = 1 MHz PARAMETER TYPt MAX UNT Ci nput capacitance 4 6 pf Co Output capacitance 8 12 pf t All typical values are at TA = 25 C and nominal voltages. 163
5 switching characteristics over recommended supply voltage range and operating free-air temperature range PARAMETER TEST CONDTONS ta(adl Access time from address ta(cs) Access time from CS CL= 1 pf tv(a) Output data valid after address change 1 Series 74 TTL load tdis Output disable time T tf(cs), tf(adl = 2 ns tc(rd) Read cycle time 3 TMS MN MAX TMS278 TMS27L8 MN MAX UNT 12 ns ns 12 ns t Value calculated from.5 volt delta to measured output level. TA 25 C program characteristics over recommended supply voltage range tw(pr) T T(PR) tsu(ad) tsu(da) tsu(pe) th(ad) th(ad,da R) th(da) th(pe) tcl,adx PARAMETER Pulse width, program pulse Transition times (except program pulse) Transition times, program pulse Address setup time Data setup time l'rogram enable setup tome Address hold time Address hold time after program input data stopped Data hold time l"rog ram enable hold time Delay time, CS(PE) low to address change MN MAX UNT.1 1 ms 2 ns 5 2 ns 1 µ.s 1 µ.s 1 µ.s 1 ns ns 1 ns 5 ns ns PARAMETER MEASUREMENT NFORMATON V 2.9 V "'"~i::~: J' '-,oo fl 1 CL 1pF FGURE 1 - TYPCAL OUTPUT LOAD CRCUT 164
6 TMS JL. TMS JL, TMS 27L8-45 JL read cycle timing tc(rd) ADDRESSES ADDRESSES VALD ADDRESSES VALD tc(rd) v'"ylflf+ l = V1L V1H \ CS(PE) 1 V1L --- ta(ad) ta(cs) j { l tv(a)-1..- VoH Q1-Q8 Hi-Z VALD VALD Nomuot VOL t --' 1--- dis }-"',_ program cycle timing CS (PE)* ADDRESSES t OF N* PROGRAM LOOPS i V1H(PJ.1,:, /, :::,i.. V1L ;.-, tsu(pe) th(pe) --+j! -ti r- tcl, ad x V1H V1L AOD",S O ADDmSL..,o,, ( ADDms,o,s O -m... th(ad) --, ~ htsulad) th(adl..,...-i- r;-tsu(ad) ' f- tw(pr) --J i 1-- tw(pr) --J 1-- tw(pr --+l j ~-- ~.:::::, 1! 4Lr-tl t,uldal -j j.- th(dal--, -ft [-_t,u(da) th(dal~ -=!"'" l,..t,u(dal th(da)~ th(ad,dar ~:iu~~~m : 1 ~3 1_N_Pu_T -JX NPUT )t NPUT EPUT *CS (PE) is at +12 V through N program loops where N;;;, 1 ms/tw (PR). NOTE: Q1-Q8 outputs are invalid up to 1 µsec after programming [cs(pe) goes low]. All timing reference points in this data sheet (inputs and outputs) are 9% points. 165
7 TYPCAL TMS 27L8-45 CHARACTERSTCS DEVCE POWER DSSPATON vs TEMPERATURE 8 4 CURRENT vs TEMPERATURE 7 ~ 6 E C l 5 = 4 i ~ ::._4)(1rv,urv, --Rt case ~nditions --r:::: - TYPtc4 :--- l-65% --~~Cle - 3 E ~ u = 2 > ii (/J " = 1 1cclMAX) CS=s v TA - Free-Air Tempafature - C TA - Free-Air Temperature - 'C :c > 4 & a 3.6 > & = = ~ 3.! a.8.6.j >.4.2 STATC OUTPUT VOLTAGE vs OUTPUT CURRENT ~ ~ TYPCAL CONDTONS ~ - i,.., lol - Output Current - ma ~ ~ 4 5 ~. ACCESS TME vs TEMPERATURE 4~-~-~--~-~-~--~-~ 3 E j: 2 i " ;/. 1 TYPCAL talcs) o~-~-~--~-~-~--~-~ TA - Free-Air Temperature - C 166
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